v/vlib/builtin/builtin_nix.c.v

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// Copyright (c) 2019-2020 Alexander Medvednikov. All rights reserved.
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// Use of this source code is governed by an MIT license
// that can be found in the LICENSE file.
module builtin
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//pub fn vsyscall(id int
//
/*
pub const (
sys_write = 1
sys_mkdir = 83
)
const (
stdin_value = 0
stdout_value = 1
stderr_value = 2
)
fn C.puts(charptr)
*/
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fn builtin_init() {
// Do nothing
}
pub fn println(s string) {
// TODO: a syscall sys_write on linux works, except for the v repl.
// Probably it is a stdio buffering issue. Needs more testing...
// $if linux {
// $if !android {
// snl := s + '\n'
// C.syscall(/* sys_write */ 1, /* stdout_value */ 1, snl.str, s.len+1)
// return
// }
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// }
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C.printf('%.*s\n', s.len, s.str)
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}
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fn print_backtrace_skipping_top_frames(xskipframes int) bool {
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skipframes := xskipframes + 2
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$if macos {
return print_backtrace_skipping_top_frames_mac(skipframes)
}
$if linux {
return print_backtrace_skipping_top_frames_linux(skipframes)
}
$if freebsd {
return print_backtrace_skipping_top_frames_freebsd(skipframes)
}
$if netbsd {
return print_backtrace_skipping_top_frames_freebsd(skipframes)
}
$if openbsd {
return print_backtrace_skipping_top_frames_freebsd(skipframes)
}
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println('print_backtrace_skipping_top_frames is not implemented')
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return false
}
// the functions below are not called outside this file,
// so there is no need to have their twins in builtin_windows.v
fn print_backtrace_skipping_top_frames_mac(skipframes int) bool {
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$if macos {
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buffer := [100]byteptr
nr_ptrs := backtrace(buffer, 100)
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backtrace_symbols_fd(&buffer[skipframes], nr_ptrs - skipframes, 1)
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}
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return true
}
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fn print_backtrace_skipping_top_frames_freebsd(skipframes int) bool {
$if freebsd {
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buffer := [100]byteptr
nr_ptrs := backtrace(buffer, 100)
backtrace_symbols_fd(&buffer[skipframes], nr_ptrs - skipframes, 1)
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}
return true
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}
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fn print_backtrace_skipping_top_frames_linux(skipframes int) bool {
$if tinyc {
println('TODO: print_backtrace_skipping_top_frames_linux $skipframes with tcc fails tests with "stack smashing detected" .')
return false
}
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$if !android {
// backtrace is not available on Android.
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$if glibc {
buffer := [100]byteptr
nr_ptrs := backtrace(buffer, 100)
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nr_actual_frames := nr_ptrs - skipframes
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mut sframes := []string
//////csymbols := backtrace_symbols(*voidptr(&buffer[skipframes]), nr_actual_frames)
csymbols := backtrace_symbols(&buffer[skipframes], nr_actual_frames)
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for i in 0 .. nr_actual_frames {
sframes << tos2( byteptr( voidptr(csymbols[i]) ) )
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}
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for sframe in sframes {
executable := sframe.all_before('(')
addr := sframe.all_after('[').all_before(']')
beforeaddr := sframe.all_before('[')
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cmd := 'addr2line -e $executable $addr'
// taken from os, to avoid depending on the os module inside builtin.v
f := C.popen(cmd.str, 'r')
if isnil(f) {
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println(sframe)
continue
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}
buf := [1000]byte
mut output := ''
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for C.fgets(charptr(buf), 1000, f) != 0 {
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output += tos(buf, vstrlen(buf))
}
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output = output.trim_space() + ':'
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if C.pclose(f) != 0 {
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println(sframe)
continue
}
if output in ['??:0:', '??:?:'] {
output = ''
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}
// See http://wiki.dwarfstd.org/index.php?title=Path_Discriminators
// NB: it is shortened here to just d. , just so that it fits, and so
// that the common error file:lineno: line format is enforced.
output = output.replace(' (discriminator', ': (d.')
println('${output:-46s} | ${addr:14s} | $beforeaddr')
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}
// backtrace_symbols_fd(*voidptr(&buffer[skipframes]), nr_actual_frames, 1)
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return true
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} $else {
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println('backtrace_symbols_fd is missing, so printing backtraces is not available.\n')
println('Some libc implementations like musl simply do not provide it.')
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}
}
return false
}